Maintenance
Safety, Operation and Maintenance Manual - Aug 2012
5-15
SY115C9/135C/155H Crawler Hydraulic Excavator
are at high temperature and high pressure, so
wait for the oil temperature to go down before
starting maintenance.
Even when the temperature goes down, the
circuit may still be under internal pressure, so
when loosening the plug or screw, or the hose
joint, do not stand in front of the part. Loosen it
slowly to release the internal pressure before
removing it.
When carrying out inspection or maintenance
of the hydraulic circuit, always bleed the air
from the hydraulic tank to remove the internal
pressure.
Periodic maintenance includes the inspection
of the hydraulic oil lever, replacement of the
fi
lter and re
fi
lling of hydraulic oil.
When the high pressure hose, etc. Is removed,
check the O-ring for damage. If necessary, re-
place it.
After the hydraulic filter element and strainer
are cleaned or replaced, or after the hydraulic
system is repaired of replaced or the hydraulic
piping is removed, bleed air from the hydraulic
circuit.
The accumulator is charged with high-pres-
sure nitrogen gas. Incorrect handling may be
dangerous.
For the handling procedure
“
Accumulator
”
on page 2-67
.